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After late ratification by Japan, the Spitsbergen Treaty came into force, giving Norway sovereignty over the Spitsbergen/Svalbard archipelago. The stipulations of the treaty meant that while Svalbard was part of Norway and under Norwegian administration, Norway could only collect enough taxes on Svalbard to support Svalbard and its government, Norway had to preserve the Svalbard environment, Norway could not discriminate against any nationals residing in Svalbard, and Norway could not permit naval bases or fortifications on Svalbard.in wikipedia

The American aviator Richard E. Byrd, and US Navy pilot Floyd Bennett, flew to and from Spitsbergen over the North Pole region in a Fokker F.VIIa/3m Tri-motor monoplane named Josephine Ford. The flight lasted fifteen hours and fifty-seven minutes, including 13 minutes of circling the Pole, and Byrd’s claim to have reached the North Pole itself made him a hero when he returned to the US.in wikipedia

The Italian-built airship Norge, carrying the Norwegian explorer Roald Amundsen, Italian aviator Umberto Nobile, American explorer Lincoln Ellsworth, and 13 other men, departed from King’s Bay at Ny-Ålesund, Svalbard, on 11 May 1926 (incidentally meeting Byrd as he prepared for his flight to the North Pole). On 12 May they reached the Pole - where they dropped Norwegian, Italian, and American flags - before traveling on to the village of Teller, Alaska, thus completing the first trans-polar crossing (and possibly the first verified trip to the North Pole).in wikipedia